FLIGHTLINE INTEL COMMERCIAL AVIATION INTELLIGENCE
Route T-100 Intelligence

IAD ↔ SEA

Two-way market traffic, capacity, airline participation and annual performance.

237,779
2026 passengers
1,664
2026 departures
86.1%
2026 market load factor

2026 airlines

CodeAirlinePassengersDeparturesLoad factor
ASAlaska Airlines Inc.113,50274586.3%
UAUnited Air Lines Inc.87,07656588.2%
DLDelta Air Lines Inc.37,20135481.2%

Annual history

YearPassengersPassengers/daySeatsDeparturesLoad factor
2015347,956953.3397,8082,42087.5%
2016378,7531,034.8448,1902,61284.5%
2017397,6911,089.6452,1502,64388.0%
2018447,3921,225.7506,8633,07488.3%
2019552,7801,514.5611,6423,74990.4%
2020160,754439.2316,4861,85850.8%
2021276,472757.5372,8132,24274.2%
2022432,8341,185.8501,0192,96986.4%
2023618,3481,694.1723,4594,46385.5%
2024631,5811,725.6713,7704,40288.5%
2025551,5121,511.0648,0933,88585.1%
2026237,7791,313.7276,0851,66486.1%
Source: U.S. Department of Transportation, Bureau of Transportation Statistics T-100 Segment data.